Board-hammer



H. TERHUNE.

BOARD HAMMER.

APPLlcmoN FILED SEPTA l. 1920.

H. TERHUNE.

BOARD HAMMER. APPLICATION FILED SEPT. 1, 1920.

Patented Aug. 23, 1921.

AQ A h,

- Cleveland, Ohio HOWARD TERHUNEOF CLIEVELAND,- OHIO.`

BOARD-'HAMMER'.

Specification of Letters Patent.

Patented Aug. 23, 1921.

Application 1ed September 1, 1920. Serial No. 407,489.

To all whom 'it may concern:

Be it known that I, HOWARD TERHUNE, a citizen of the United States,residing in have invented certain Improvements in l3oard-Hammers, ofwhich the following is a specication.

One object of my invention is to improve the construction of a drophammer of the board type so that the rollers that impinge upon the boardwill remain true in their bearings under all conditions and will bearevenly upon the board.

A further object of the invention is to construct the driving mechanismfor the rollers so that the shaft of each roller will be free to movelaterally when wear takes place without interfering with the properalinement of the rolls in their bearings.

In the acompanying drawings:

Figure 1 is a side elevation, partly in section, of a board drop hammerillustrating my invention, the section being on the line 1-1, Fig. 2;and

Fig. 2 is a sectional plan view on the line 2-2, Fig. 1, drawn to anenlarged scale.

1 is the base of the hammer on which are mounted the standards 2.Located between the standards is the hammer 3 of the ordinary type towhich is attached the board 4. This hammer is adapted to suitable guidesin the standard and means is provided for engaging the operatinmechanism as the hammer is reciprocate As my invention relates entirelyto the method of mounting the rollers that grip the board, I haveomitted all details relating to other portions of the drop hammer.

The two rolls 5, 5 are mounted in bearings 6 and 7. Bearings for eachroller are carried by a rocking yframe 8. Each frame is eccentricallymounted in bearings 9 of a frame 10 secured to the upper end of thestandard 2. Each rocking frame has projecting arms 11, which areconnected by pins 12 to heads 13. One of these heads is connected to afixed rod 14 and the other to a rod 15 actuated, in the presentinstance, by the hammer. This mechanism forms no part of the presentinvention.

16, 16 are two shafts, each having a belt wheel 17 by which it isdriven. Each shaft is mounted in a bearing 1 8 in its rocking frame andextends through an enlarged opening 19 in one end of the roller 5 andfits in an opening'ZO in the other end of the roller and is securedtherein by a key 21. The shaft 16 is reduced at 22 where it extends intothe opening 20, forming a shoulder.

By this construction, it will be seen that each roller is free to movetoward and from the board 4 on operating the rocking frames 8, and thismovement is in no way interfered with by the driving shafts 16 of therolls, as each shaft is mounted in an independent bearing 18 in itsrocking frame and is secured at its inner end to the far end of itsroller and passes freely through an opening 19 at the opposite end ofthe roller so that irrespective of the wear of the bearing 18, due tothe pull of the belt, the bearing of the rollers upon the board will notbe affected and, consequently, the rollers will bear evenly upon thefull width of the hoard at all times.

I claim:

1. The combination in a board hammer, of standards; a hammer guided inthe standards; a board attached to the hammer; two rollers arranged toengage the board and to lift the hammer; bearlngs at the upper end ofthe structure; rocking frames mounted eccentrically in the bearings;means for turning the rockin frames; bearings for the rollers mounte inthe frames; and a driving shaft for each roller having its bearing inthe rocking frame and passing freely through an opening in one end ofthe roller and attached at its inner end to the opposite end of theroller so that the wear of the shaft in its bearing will not affect theposition of the roller in respect to the board.

2. The combination in a board hammer, of a base; two standards mountedon the base; a frame carried by the standards; a hammer adapted toguides in the standards; a board attached to the hammer; twoeccentrically y posite end o'f the roller; and a key securing tached tothe hammer; two rollers arranged the shaft to the roller, thearrangement being to engage the board to lift the hammer; and such thatany Wear of the shaft in its beara driving shaft for each roller soconnected 10 ing will not afeet the position of the rollers thereto asto allow the shaft to move later- 5 in respect to the board. e ally inits bearing without affecting the si- 3. The combination in aboardhammer, of tion of the rollers in res ect to the boar a hammer; guidestherefor; a board at- HOWRD TERHUNE.

